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Microscopic mechanism for transient population inversion and optical gain in graphene

A transient femtosecond population inversion in graphene was recently reported by Li et al., Phys. Rev. Lett. 108, 167401 (2012). Based on a microscopic theory we clarify the underlying microscopic mechanism: Transient gain and population inversion in graphene occurs due to a complex interplay of strong optical pumping and carrier cooling that fills states close to the Dirac point giving rise to a relaxation bottleneck. The subsequent femtosecond decay of the optical gain is mainly driven by Coulomb-induced Auger recombination.

preprint2012arXivOpen access
Torben WinzerErmin MalicAndreas Knorr
cond-mat.mes-hall
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Open access3 authors1 topic
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Torben WinzerErmin MalicAndreas Knorr

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